Overview

Master Lock is a well-known American manufacturer of locks and security hardware. Founded in 1921, the company built its reputation on sturdy, mass-produced padlocks and expanded into a range of portable and fixed security devices. Its product lines are commonly used by households, schools, businesses, and industry. For an overview of company offerings see the manufacturer's site: Master Lock corporate page.

Products and design

Master Lock produces several categories of locks and related hardware. Typical items include padlocks and combination locks, door locks and deadbolts, security hasps, cable and bike locks, and small lock boxes. Many of these items are designed for general-purpose security rather than high-assurance applications. For details on padlock models and specifications consult the product catalog: padlocks and combinations.

Common design features emphasize corrosion resistance, ease of use, and cost-effective construction. The brand is associated with laminated steel padlocks and a range of shackle sizes and materials; some models also include weatherproofing or built-in alarms. For information about door hardware and installation options see door lock products.

History and notable marketing

Harry Soref founded Master Lock in 1921 and introduced manufacturing methods that helped make padlocks more affordable and widely available. The company grew through the 20th century as demand for convenient security products rose in both consumer and commercial markets.

Master Lock achieved broad public recognition through memorable advertising and demonstrations of product toughness. One widely seen commercial featured a Master Lock #15 remaining intact after being shot with a .30 caliber rifle; that clip has been frequently cited and reproduced in discussions of the brand's durability and advertising approach. Archive footage and references to that campaign are available here: advertising example.

Uses, limitations, and selection tips

Master Lock items are commonly used to secure lockers, gates, storage units, bicycles, and toolboxes. When selecting a lock, users should consider the intended threat model: casual theft, opportunistic tampering, or determined attacks. Higher security needs often require hardened steel shackles, rekeyable cylinders, or certified high-security locks, while many Master Lock models suit everyday, low-risk uses.

Security professionals note that padlocks can be bypassed by cutting, picking, or leveraging poorly installed hardware. To improve protection, pair a quality padlock with a secure hasp and proper mounting, and check product ratings and warranties. For technical specifications and compatibility with other hardware consult product documentation or retailer resources.

Notable facts and distinctions

  • Founding: established in 1921 by Harry Soref.
  • Signature product: widely known for mass-market padlocks and the laminated-steel approach.
  • Brand recognition: the rifle commercial and consistent retail presence have made the name familiar to many consumers.